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An application of near infrared spectroscopy to the study of carbonate minerals-smithsonite, rhodochrosite, sphaerocobaltite and cadmium smithsonite

Frost, Ray L., Reddy, B. Jagannadha, Hales, Matthew C., & Wain, Daria L. (2006) An application of near infrared spectroscopy to the study of carbonate minerals-smithsonite, rhodochrosite, sphaerocobaltite and cadmium smithsonite. Journal of Near Infrared Spectroscopy, 14(5), pp. 317-324.

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Abstract

NIR spectroscopy has been applied to the study of selected calcite group minerals including smithsonite, rhodochrosite, sphaerocobaltite and cadmium smithsonite. The isomorphic substitution of calcium in calcite group minerals by divalent cations such as Fe, Cu, Cd, Mn, Mg, Co, Zn is in agreement with variable spectral properties observed through NIR spectroscopy. This substitution results in highly coloured minerals. The NIR spectra of calcite group minerals that contain absorption features due to the divalent cations, Fe2+, Cu2+ and Co2+ act as an aid to mineral identification. The main indicator is the strength of ferrous ion bands in the near infrared spectra supporting spectral classification of calcite group minerals. The observation of Cu2+ bands in smithsonite and cadmium smithsonite with different band positions around 12400 and 8500 cm-1 (0.81-1.18 µm) confirms Cu2+ substitution for Zn2+. Co2+ is the major cation in sphaerocobaltite and exhibits a strong feature from 12000 to 7000 cm-1 (0.83-1.43 µm) which is distinctly different from other minerals of the group. The broad band centred at 9835 cm-1 (1.02 µm) with a split component at 8186 cm-1 (1.22 µm) is assigned to 4T1g(F) ® 4T2g(F) spin-allowed transition of Co2+ ion. Significant shifts are observed for carbonate ion due to the wide range of cation substitutions in the mineral structure in conjunction with the ferrous iron which is a common impurity in calcite minerals. This NIR spectral fearures enable mineral identification. The implication is that NIR spectroscopy can be used to remotely detect carbonate minerals and assess their isomorphic substitution.

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ID Code: 6050
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website (see link) or contact the author. Author contact details: r.frost@qut.edu.au
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Keywords: smithsonite, cadmium smithsonite, rhodochrosite, sphaerocobaltite, NIR spectroscopy, cation substitution, ferrous
ISSN: 0967-0335
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 NIR Publications
Deposited On: 02 Feb 2007
Last Modified: 29 Feb 2012 23:25

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